Clutch brake



Sept. 1, 193.1. H. D. CHURCH 1,820,961

CLUTCH BRAKE Filed Feb. 24, 1927 2 sheets-sheet 1 will,

f lNvENToR 4in/QQ afa/fc# @gr TTORNEYS SePfvl, 1931-. H. D. CHURCH1,820,961

CLUTCH BRAKE Filed Feb. 24, 1927 2 Sheets-Sheet 2 yf@ n f@ /AV/ 4 vINVENTOR ,www D. @ffy/PCH BY Psa-naa sept. 1, 1931 UNITED STATES PATENToFl-lca HAROLD D. GEORGE, OF CLEVELAND, OHIO, `ASSIGNOB' TO THE WHITEKOTOR OOHPANY, 0F CLEVELAND, OHIOUAIXJRPOBATION OF OHIO cLUrcn namappunti maren-nary a4, 1m. semi no. 17am.

This' invention relates to power transmission gearing in which series ofgears may be engaged tovary the relative s d an /or direction vof theshafts fromw ich and to i a which the power is being transmitted. It

- is'particularly applicable to the transmission gearing'of automotivevehicles and especially advantageous in trucks and other large vehicleswhere the power is considerable and the n parts must therefore be hea Ingeneral, the usual se ective type of gear shift has-been consideredconvenient and satisfactor in use on pleasure and other light vehic es.Its use has been attended with 15 serious diilculty when applied totrucks, tractors and -other vehicleswhere large amounts of power' mustbe transmitted and in which-the transmitting clutches, etc. mustconsequently be relatively heavy.A In trans- 20 missions wherethe'weight of the parts is considerable the motor shaftl tends to keepthe Egrts rotating, even when a clutch or the like y tween the partsandthe motor is disengaged and when they are disconnected from 25 thewheels of the vehicle. This frequently makesit ditlicult to shift gears'as the" ar teeth are apt to meet. end to end instea of sliding into meshand, due totheir motion, discordant noises are produced or the teeth amay become chi ped or broken.

' It has hereto ore. been proposed to arrest the movement of the partsof the transmission in some manner so that these will come to restshortly after the clutch has been disrs. However, none of the devicesheretode produced will satisfactoril produce this result and moreoverthey quic y become worn and inoperative.

I have provided means" by which the speed like maybe readily controlled,in which the control may be made automatic upon operation of the clutch,in which wear does not readily occur, and in which such wear as doesoccur may be readily com nsated for.

The invention will be etter understood from the description of onepractical emb odiment vthereof illustrated in the accom- 50 panyingdrawings in which engaged, and thus facilitate the shifting of of theparts within a transmission 4or the- Fig. 1 is a longitudinal sectionalview of an automobile transmission and clutch, proyided with apparatusembodying my inven- 1on; Fig. 2 is an enlarged fragmenta section takenon a plane parallel to that-gf Fig. 1, but with arts omltted or brokenaway; and

Fig. 3 '1s a horizontal section taken on the line 3 3 ofFig. 1.

The crankshaft of the engine or motor by which the vehicle ispropelled-is shown at 1 and delivers power to the propelling shaft 2 ofthe vehicle 1 through a clutch 3 and transmission gearing of theselective type.A

A pedal 4 is provided for operating the clutch, the pedal being pivotedupon a casing 5 which surrounds. the transmission gearing. The lower end6 lof the dal lever is 4connected by an adjustable lin 7 to a lever 8mounted on a shaft 9, which extends into 7o the interior of the housingor casin 5 and vis provided with a forked arm 10 w ich Yen ges thevclutch mechanism. It will thus gli seen that the downward movement ofthe pedal 4 moves the arm 10 in a forward direc- 7l tion, releasing theclutch. Extending rearwardly from the clutch is a short shaft 11carrying on its rear end a pinion 12 which delivers power to thetransmission gearing. Meshing with the pinion 12 is a ,o

gear 13 carried on a countershaft- 14, these two gears remaining alwaysin mesh. ,Other gears arev carried by the back shaft and by a drivenshaft 15 coaxial with the shaft 11 and having its forward end carried ina bearing 16 within pinion 1.2. The gears may be moved relatively ofeach other to connect the driven shaft to the drive shaft in any one ofa plurality of gear ratios. For example, gear 17 havi internal teeth,may be slid over the 9o end of pinion 12 and the shafts thus directlconnected, or gear 17 may be moved into m with gear 18, carried by thecountershaft, and the driven shaft thus moved at a lower speed inrelation to that of the drive shaft. The es operation of these gears andshaft, however,

Ymay be of any known or desired construction.

The back shaft 14is continued through the rear wall to the housing 5-andits end 1s sur'- rounded by a casing s19 hereinafter referred 100 to asa pump casing. `Upon the end of the shaft and within the pump casing isa pinion and this pinion in turn meshes: with the second pinion 2lcarried by a shaft supported by the walls of the pump casing.

The pump casing fits about the pinions so j discharge pipeleads to avalve casing 24, from which casing is an opening discharging into thetransmission housing so that the oil is pumped from one part of thehousing to another.

for` lubricatin However, a ilui grease should operate satis- Within thevalve casing is a balanced piston .valve 25 controlling the inlet port26, byv

which the oil is received 'from pipe the piston being held in itslowermost position to complete y uncover the port by a spring 27,retained in place by a cap 28. A rod or stem 29' extends outwardlthrough the cap and is threaded and providje'ed with lock nuts 30 foradjustably locating a trunnioned sleeve 31 upon the stem. The trunnionson the :sleeve are carriedin the bifurcated ends of a lever 32 carriedupon the end of shaft 9. During the ordinar operation of the vehiclewhen the parts o the transmission are all rotated, the oil is pumpedfreely through the pipes 'above described and the resistance imposedupon the pump gearing is negligible. It will be seen that when theclutch'pedal is depressed to disengage the clutch, lever 32 is movedupwardly until sleeve 31 engages the lock nut 30, and further upwardmotion moves the entire valve upward, restricting port 26 and fthusincreasing the load upon pumping gears l20 and 21. This increase of oad,of course,` will retard the rotation of back shaft 14, and if the loadis suiiicient will completely stopv the same, also stopping themtationof driving shaft 11 through gear 13 and pinion 12; B yadjustingthe lock nuts 30,

the area of the o ning at port 26l vwhen the pdal is complete y down,may be varied from ing entirely closed to wide open. The

amount of resistance necessary to stop the gears ma thus be readilyobtained and any wear in t e gear pump ma -be readily compensated forwithout adJusting any part within the transmission housing.

v In order that the lubricant may pass properly through the pump, I lindit desirale to use a heavy oil rather than a. grease the transmissiongears.

factorily. l v

While I have described the illustrated embodiment of. my invention insome particuprecise details shown and described, but

claim as my invention all embodiments thereof coming within the scopeclaims:

I claim:

of the appended ,1. A power transmission device' comprisv ing a driveshaft, a driven shaft, a clutch, power transmission gearing between saidclutch and driven shaft, a pump driven by said power transmissiongearing, and .normally freely circulating fluid, a valve for restrictingthe flow of said iiuid, and means for automatically actuating said valvewhen the clutch. is disengaged.

2. A power transmission device lcomprising a drive shaft, a drivenshaft, a clutch and .power transmission gearing betweenv said drive anddriven shafts, a housing enclosing said transmission gearing, a fluidpump driven'by said transmission gearing and drawing lubricant from saidhousing and dischargby said back' shaft and having an inlet with# insaid vhousing and a discharge 'to another point in said housing, abalanced valve controlling the discharge from said pump andautomaticallyactuated to restrict said discharge when the clutch isdisengaged.

4. A power transmission device compris inga driven shaft, a clutch,power trans' mission gearing between said clutch and driven shaft, afluid brake for the gearing, and a single actuator for disengaging theclutch and applying said brake after the clutch is disengaged.

5. In combination with a drive shaft and a driven shaft, a clutchinterposed therebetween, means for transmitting power from said clutchto said drive shaft, afluid brake' for stopping said power transmissionmeans,

brake, an actuator for said clutch, and a contween said shafts, a clutchbetween the gearing and the drive'shaft, a Huid pum actuated by saidtransmission gearing an free to pump fluid without substantialresistance,

la control valve for increasing the resistance of said fluid to causethe pump to act as a 130 a valve controlling the operation of said fluidi vnection between said actuator and valve for 12o brake upon saidtransmission gearin an actuator connected to said clutch, an aconnection from the actuator controlling the valve., v

' 7;, In combination with a drive shaft and a driven shaft, a back shaftand clutch interposed therebetween, an actuator for the clutch, the backshaft. being provided with a gear, an idle gear meshing therewith,the

two gears constituting a Huid for controlling the resistance o throughthe pump,

pump, a valve duid passing nection between said valve and said actuator.

therefrom and including. change speed gearing, means for operating saidclutch, and

means for exerting a rotation resisting force on certain oi said gearingvarying with the speed of such gearing, said means being actuated bysaid clutch operating means.

9. En a motor vehicle, the combination of a i motor, a ciutch fortransmitting the power of said motor, transmission mechanism aspscciated with said clutch to receive power iid therefrom and includingchange speed geai'-,

ing, means for operating said clutch, andl duid brake means actuated .bysaid clutch operating means for controllin lthe s eed of certain of saidgearing tofacilitate s iftin from one speed to another. i'

n testimony whereof I hereunto affix my -signataire this 17 th dav ofFebruarv, 1927 HARLD D. CHURCH.

and an operating cbn-A

